1671612109 has 2 divisors, whose sum is σ = 1671612110. Its totient is φ = 1671612108.

The previous prime is 1671612079. The next prime is 1671612157. The reversal of 1671612109 is 9012161761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887444100 + 784168009 = 29790^2 + 28003^2 .

It is an emirp because it is prime and its reverse (9012161761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1671612109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1671612169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835806054 + 835806055.

It is an arithmetic number, because the mean of its divisors is an integer number (835806055).

Almost surely, 2^1671612109 is an apocalyptic number.

It is an amenable number.

1671612109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671612109 is an equidigital number, since it uses as much as digits as its factorization.

1671612109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1671612109 is about 40885.3532331567. The cubic root of 1671612109 is about 1186.8026375550.

The spelling of 1671612109 in words is "one billion, six hundred seventy-one million, six hundred twelve thousand, one hundred nine".